EP2762804A1 - A method of charging a coolant - Google Patents
A method of charging a coolant Download PDFInfo
- Publication number
- EP2762804A1 EP2762804A1 EP14388001.1A EP14388001A EP2762804A1 EP 2762804 A1 EP2762804 A1 EP 2762804A1 EP 14388001 A EP14388001 A EP 14388001A EP 2762804 A1 EP2762804 A1 EP 2762804A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hose
- coolant
- charging
- pressure
- cooling system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002826 coolant Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 16
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000004260 weight control Methods 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/001—Charging refrigerant to a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/006—Details for charging or discharging refrigerants; Service stations therefor characterised by charging or discharging valves
Definitions
- the invention relates to a method of charging a coolant into a cooling system via a conduit, such as a hose, to which the coolant is applied at the inlet end, and which is connected with the cooling system at the outlet end, and wherein the charging is controlled by a meter on the inlet end of the hose which controls a valve at the outlet end of the hose, a device therefor and use thereof.
- a conduit such as a hose
- Examples of such a charging are known from JP 8 303 960 A and US 4 470 265 A , both of which describe charging by weight of the coolant.
- the measured and calculated amount of coolant is just a measure of the amount which passes through the meter.
- this amount is not the amount which passes the charging valve at the outlet side of the hose because of the length of the hose between the measurements and the valve. This means inaccuracy of the charged amount of coolant.
- the pressure may drop through the hose, as it will normally be higher at the inlet end than at the outlet end, and, thereby, that its density is higher at the inlet end than at the outlet end during the charging.
- Fig. 1 shows an example of a known method of charging, illustrated by a system drawing which shows the coolant in a pressure cylinder 1 connected with a pump 2, which urges the coolant via a conduit 2a through a quantity meter 3 to a hose 4, which may have a length of several metres.
- the outlet end of the hose 4 has mounted therein a flow valve 5, which, via a signal 5a from the meter 3, controls the supply of gas via a conduit 6a to the cooling system 6 into which the coolant is to be charged.
- Fig. 2 shows an example of a system according to the invention, comprising a hose 4, to which the coolant is fed under pump pressure via the conduit 2a, and with a flow valve 5 for the control of the coolant via a conduit 6a to a cooling system (not shown).
- sensors are mounted according to the invention. These sensors of temperature T and pressure P, respectively, are mounted at the inlet end as well as the outlet end of the hose 4. These sensors are indicated by Ts and Ps for the inlet sensors and Te and Pe for the outlet sensors, respectively.
- the sensors send a signal to a computer 11 via signal generators 7a and 9a for the inlet part and 8a and 10a for the outlet part of the hose.
- a signal 5a is applied to the valve 5, which can thereby block the flow and thus the charging into the cooling system.
- the signal generators will be gathered around the hose 4, which will thereby be a carrier of these, at the same time as the coolant is conveyed via the interior of the hose.
- Coupling means between the charging part and the cooling system will be mounted in a generally known manner at the outlet end of the hose, where the valve 5 is mounted.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Pipeline Systems (AREA)
Abstract
Description
- The invention relates to a method of charging a coolant into a cooling system via a conduit, such as a hose, to which the coolant is applied at the inlet end, and which is connected with the cooling system at the outlet end, and wherein the charging is controlled by a meter on the inlet end of the hose which controls a valve at the outlet end of the hose, a device therefor and use thereof.
- Such a method takes place in connection with service and repair of cooling systems.
- When a gaseous coolant is used, special physical conditions are involved, and thereby conditions which have to be taken into consideration when a given amount of gaseous coolant has to be charged.
- Known methods concern charging by weight, which means that the charged amount is weighed currently during the charging.
- Examples of such a charging are known from
JP 8 303 960 A US 4 470 265 A , both of which describe charging by weight of the coolant. - Charging based on the measurement of the mass flow of the coolant is known from
US 5 231 841 A . A constant volumetric flow is maintained by means of a flow valve. By measuring the pressure and the temperature the density may be determined after the valve, following which the mass flow may be calculated. - A similar method is known from
US 5 758 506 A . Here, too, the mass flow is measured. By using a fixed resistance in the form of a nozzle and by measuring the pressure difference across the nozzle and measuring temperature and pressure before and after the nozzle, the flow through the nozzle - and thereby the charging - may be calculated. - These charging methods, however, suffer from a considerable inaccuracy, which is caused by the fact that the charging takes place via a hose whose interior volume depends on its length, which may be up to 7 metres, as well as its internal diameter, just as the supply pressure of the coolant, its temperature and the temperature of the surroundings have an effect on the density of the coolant. This is measured in weight per unit of volume.
- Thus, the measured and calculated amount of coolant is just a measure of the amount which passes through the meter. However, this amount is not the amount which passes the charging valve at the outlet side of the hose because of the length of the hose between the measurements and the valve. This means inaccuracy of the charged amount of coolant.
- To this should be added that the pressure may drop through the hose, as it will normally be higher at the inlet end than at the outlet end, and, thereby, that its density is higher at the inlet end than at the outlet end during the charging.
- This means that the average density of the coolant in the hose will be smaller, and, thereby, that the amount in the hose will have dropped relative to at the inlet side in the hose. Thus, the hose has been emptied to a certain degree from start to end of the charging, which amount will have been added to the cooling system without the meter having recorded it.
- This difference in density will moreover be dependent on the length of the hose and its internal diameter, which, however, are variables which may be included in the necessary calculation of the compensation.
- These factors contribute to making it difficult to charge the correct and precise amount of coolant into a cooling system.
- It is the object of the invention to remedy this defect of the known methods of charging coolant into a cooling system.
- This is achieved by a method according to the invention, in which the temperature of the coolant as well as its pressure is recorded currently at its admission to the hose and/or at its discharge from the hose. This ensures the highest possible accuracy in a simple manner, and thereby certainty that precisely the desired amount of coolant is charged irrespective of the physical state of the coolant.
- When, as stated in
claims - Finally, as stated in
claim 4, it is expedient to use the method for the control and regulation of the charging of a gaseous coolant, since there will be a relatively great difference in density through the hose owing to the flow and the pressure drop created thereby. - An example of an embodiment of the method and a device therefor will be described more fully below with reference to the drawing, in which
- fig. 1
- shows a basic sketch of the known charging method, and
- fig. 2
- shows the method according to the invention.
-
Fig. 1 shows an example of a known method of charging, illustrated by a system drawing which shows the coolant in apressure cylinder 1 connected with apump 2, which urges the coolant via aconduit 2a through aquantity meter 3 to ahose 4, which may have a length of several metres. - The outlet end of the
hose 4 has mounted therein aflow valve 5, which, via asignal 5a from themeter 3, controls the supply of gas via aconduit 6a to thecooling system 6 into which the coolant is to be charged. - This method is not very accurate, since the charging amount is solely based on a
meter 3, and where no consideration is paid to the density of the coolant, which will be dependent on the temperature of the coolant itself, the temperature around the system, its pressure and the volume of the hose. -
Fig. 2 shows an example of a system according to the invention, comprising ahose 4, to which the coolant is fed under pump pressure via theconduit 2a, and with aflow valve 5 for the control of the coolant via aconduit 6a to a cooling system (not shown). - To ensure accurate charging, sensors are mounted according to the invention. These sensors of temperature T and pressure P, respectively, are mounted at the inlet end as well as the outlet end of the
hose 4. These sensors are indicated by Ts and Ps for the inlet sensors and Te and Pe for the outlet sensors, respectively. - The sensors send a signal to a
computer 11 viasignal generators - This allows software in the
computer 11 to calculate the density of the gas flow through thehose 4 and thereby to compensate the amount passing through thevalve 5, and thereby to ensure that the precise amount of coolant is charged irrespective of its physical state, and no matter whether the coolant is in gas form or liquid form. - When a predetermined amount has passed through the
valve 5, asignal 5a is applied to thevalve 5, which can thereby block the flow and thus the charging into the cooling system. - Hereby, the charging is more precise, since the accurate amount of coolant and thereby the most economical maintenance and operation of a cooling system of this type are ensured.
- In practice, the signal generators will be gathered around the
hose 4, which will thereby be a carrier of these, at the same time as the coolant is conveyed via the interior of the hose. Coupling means between the charging part and the cooling system will be mounted in a generally known manner at the outlet end of the hose, where thevalve 5 is mounted.
Claims (4)
- A method of charging a coolant into a cooling system via a conduit, such as a hose, to which the coolant is applied at the inlet end, and which is connected with the cooling system at the outlet end, and wherein the charging is controlled by a meter on the inlet end of the hose which controls a valve at the outlet end of the hose, and wherein the density of the coolant during the charging is monitored currently, comprising current recordal of the temperature of the coolant as well as its pressure in the hose to achieve a precise charging of the cooling system, characterized in that both the temperature (T) of the coolant and its pressure (P) are currently recorded both at its admission (7 and 9) to the hose (4) and/or at its discharge (8 and 10) from the hose (4).
- A device for recording and controlling the charging according to claim 1, characterized in that both temperature (T) and pressure (P) are measured by sensors (9, 10 and 7, 8) located at the inlet end and the outlet end of the hose (4), respectively.
- A device according to claim 2, characterized in that the control of the amount of coolant takes place in a computer (11), to which the signals from the temperature sensors (9a and 10a) and the pressure sensors (7a and 8a) are applied, and from which a signal (5a) is applied for the control of the valve (5).
- Use of the method according to claim 1 as well as the device according to claims 2 and 3, characterized in that it is used for controlling the charged coolant into a cooling system (6), said coolant being supplied via a hose (4) of variable length and thereby volume, and in consideration of the temperature (T) and the pressure (P) of the coolant in the hose (4).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA201300065 | 2013-02-04 | ||
DK201300156A DK178047B1 (en) | 2013-02-04 | 2013-03-18 | Refrigerant filling process |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2762804A1 true EP2762804A1 (en) | 2014-08-06 |
EP2762804B1 EP2762804B1 (en) | 2016-10-05 |
Family
ID=50114324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14388001.1A Active EP2762804B1 (en) | 2013-02-04 | 2014-02-04 | A method of charging a coolant |
Country Status (4)
Country | Link |
---|---|
US (1) | US9488397B2 (en) |
EP (1) | EP2762804B1 (en) |
CN (1) | CN104034104B (en) |
DK (1) | DK178047B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016011990A1 (en) | 2014-07-22 | 2016-01-28 | Dürr Somac GmbH | Device for filling vehicle air conditioning systems with coolant r744 |
DE102014011836A1 (en) | 2014-08-08 | 2016-02-11 | Dürr Somac GmbH | Device for filling vehicle air conditioning systems with refrigerant R744 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11129399B2 (en) * | 2016-08-16 | 2021-09-28 | Messer Industries Usa, Inc. | In-line cryogenic method and system for cooling liquid products |
CN111981732B (en) * | 2020-07-24 | 2021-07-27 | 中标能效科技(北京)有限公司 | Automatic refrigerant filling device and method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5231841A (en) * | 1991-12-19 | 1993-08-03 | Mcclelland Ralph A | Refrigerant charging system and control system therefor |
US20060010898A1 (en) * | 2004-07-16 | 2006-01-19 | Snap-On Incorporated | System for refrigerant charging with constant volume tank |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4470265A (en) * | 1982-05-10 | 1984-09-11 | Gerlach Industries | Refrigerant charging system |
US5758506A (en) * | 1996-07-03 | 1998-06-02 | White Industries, Llc | Method and apparatus for servicing automotive refrigeration systems |
US5802859A (en) * | 1996-12-16 | 1998-09-08 | Hudson Technologies, Inc. | Apparatus for recovering and analyzing volatile refrigerants |
JP4124228B2 (en) * | 2005-12-16 | 2008-07-23 | ダイキン工業株式会社 | Air conditioner |
JP4165566B2 (en) * | 2006-01-25 | 2008-10-15 | ダイキン工業株式会社 | Air conditioner |
CN201363976Y (en) | 2009-03-11 | 2009-12-16 | 耿功业 | Full-automatic refrigerant quantitative adding machine |
US10088202B2 (en) * | 2009-10-23 | 2018-10-02 | Carrier Corporation | Refrigerant vapor compression system operation |
-
2013
- 2013-03-18 DK DK201300156A patent/DK178047B1/en active
-
2014
- 2014-02-04 EP EP14388001.1A patent/EP2762804B1/en active Active
- 2014-02-04 US US14/171,841 patent/US9488397B2/en active Active
- 2014-02-07 CN CN201410116575.XA patent/CN104034104B/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5231841A (en) * | 1991-12-19 | 1993-08-03 | Mcclelland Ralph A | Refrigerant charging system and control system therefor |
US20060010898A1 (en) * | 2004-07-16 | 2006-01-19 | Snap-On Incorporated | System for refrigerant charging with constant volume tank |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016011990A1 (en) | 2014-07-22 | 2016-01-28 | Dürr Somac GmbH | Device for filling vehicle air conditioning systems with coolant r744 |
DE102014011051A1 (en) | 2014-07-22 | 2016-01-28 | Dürr Somac GmbH | Device for filling vehicle air conditioning systems with refrigerant R744 |
US10480836B2 (en) | 2014-07-22 | 2019-11-19 | Dürr Somac GmbH | Device for filling vehicle air conditioning systems with refrigerant R744 |
DE102014011836A1 (en) | 2014-08-08 | 2016-02-11 | Dürr Somac GmbH | Device for filling vehicle air conditioning systems with refrigerant R744 |
WO2016019940A1 (en) | 2014-08-08 | 2016-02-11 | Dürr Somac GmbH | Device for filling vehicle air conditioning systems with coolant r744 |
Also Published As
Publication number | Publication date |
---|---|
DK178047B1 (en) | 2015-04-13 |
CN104034104B (en) | 2017-05-24 |
US9488397B2 (en) | 2016-11-08 |
US20140216073A1 (en) | 2014-08-07 |
CN104034104A (en) | 2014-09-10 |
EP2762804B1 (en) | 2016-10-05 |
DK201300156A1 (en) | 2014-09-25 |
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